It's like looking through 6-8 diopter glasses. I think it's useless and completely fake construction, cheap material, the cheapest plastic they could find. If it was actually made of glass, its magnifying lens would work as we believed, misled by the words "Mobile Screen Magnifier". Otherwise, it's a classic Chinese product unworthy of its price. I would easily give it away to anyone who wants it. / Worthless piece of crap...

Clever 3D Mobile Screen Magnifier in Black color
1. The Mechanical part of the Screen does not have all the settings.
2. With Natural light, the large Screen has many reflections from the surrounding area. It is better in complete darkness.